钢混组合结构PBL剪力键滑移损伤监测试验研究  

Experimental study on slip damage monitoring of PBL shear key in steel-concrete composite structures

作　　者：蒋田勇 吴海军 黄天皓 JIANG Tian-yong;WU Hai-jun;HUANG Tian-hao(School of Civil Engineering,Changsha University of Science&Technology,Changsha 410114,China;Changsha Architectural Design Institute Co.,Ltd.,Changsha 410007,China)

机构地区：[1]长沙理工大学土木工程学院,湖南长沙410114 [2]长沙建筑设计院有限责任公司,湖南长沙410007

出　　处：《长沙理工大学学报（自然科学版）》2020年第4期23-31,共9页Journal of Changsha University of Science and Technology:Natural Science

基　　金：国家自然科学基金资助项目(51778068,52078058);湖南省自然科学基金资助项目(2019JJ40301);湖南省教育厅科学研究重点项目(17A010);长沙理工大学双一流科学研究国际合作项目(2018IC18)。

摘　　要：为了保证钢混组合结构的正常使用和实现对PBL剪力键滑移损伤的有效监测,提出了一种基于压电陶瓷的钢混组合结构PBL剪力键滑移损伤监测方法。设计了两组钢混组合结构PBL剪力键滑移损伤监测试件,在其中一组试件的型钢与混凝土的接触界面涂了一层黄油,另一组则未涂黄油。在试件中布置压电智能骨料驱动器和压电陶瓷传感器采集滑移损伤的响应信号。研究结果表明:传感器接受到的信号幅值随滑移损伤程度加深而下降,其小波包能量也随着相对滑移量增加而下降;黄油使得钢混界面更加紧密,减少了应力波在传播过程中的耗散。In order to ensure the normal use of steel-concrete composite structures and effectively monitor the slip damage of PBL shear key,a method for monitoring the slip damage of PBL shear key in steel-concrete composite structures based on piezoelectric ceramics was proposed.Two groups of specimens of PBL shear key were designed to monitor slip damage in steel-concrete composite structures.One group of specimen was coated with a layer of butter at the interface between steel and concrete,while the other group was not coated with butter.The piezoelectric intelligent aggregate actuators and piezoelectric ceramic sensors were arranged in the specimens to collect response signals of slip damage.The study results show that the amplitude of the signal received by the sensors decreases with the increase of slip damage degree,and the energy of the wavelet packet decreases with the increase of relative slip amount.The butter makes the interface between concrete and steel closer and reduces the dissipation of stress wave in the propagating process.

关 键 词：钢混组合结构 PBL剪力键 结构损伤监测 压电波动法 滑移损伤 

分 类 号：U446.1[建筑科学—桥梁与隧道工程]